If a commercial driver has a blood alcohol level of 0.04%, what immediate consequence may they face?

A commercial driver with a blood alcohol concentration (BAC) of 0.04% faces the immediate consequence of being placed out of service. This is due to the fact that federal regulations dictate stricter standards for commercial drivers when it comes to alcohol use compared to ordinary drivers. For commercial drivers, a BAC of 0.04% is considered a violation of these regulations, and as a result, they are not permitted to operate a commercial vehicle until they have been evaluated and cleared. This measure is crucial to ensure the safety of all road users, especially since commercial vehicles often carry passengers or hazardous materials.

In contrast, other options like a traffic ticket, mandatory driving class, or vehicle impoundment do not directly relate to the immediate consequences linked to the BAC level established for commercial drivers.